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Journal Article
Research Support, Non-U.S. Gov't
Interactions between BTB domain of CP190 and two adjacent regions in Su(Hw) are required for the insulator complex formation.
Chromosoma 2018 March
The best-studied Drosophila insulator complex consists of two BTB-containing proteins, the Mod(mdg4)-67.2 isoform and CP190, which are recruited cooperatively to chromatin through interactions with the DNA-binding architectural protein Su(Hw). While Mod(mdg4)-67.2 interacts only with Su(Hw), CP190 interacts with many other architectural proteins. In spite of the fact that CP190 is critical for the activity of Su(Hw) insulators, interaction between these proteins has not been studied yet. Therefore, we have performed a detailed analysis of domains involved in the interaction between the Su(Hw) and CP190. The results show that the BTB domain of CP190 interacts with two adjacent regions at the N-terminus of Su(Hw). Deletion of either region in Su(Hw) only weakly affected recruiting of CP190 to the Su(Hw) sites in the presence of Mod(mdg4)-67.2. Deletion of both regions in Su(Hw) prevents its interaction with CP190. Using mutations in vivo, we found that interactions with Su(Hw) and Mod(mdg4)-67.2 are essential for recruiting of CP190 to the Su(Hw) genomic sites.
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